Pulsar spindle nut wobble

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Thread: Pulsar spindle nut wobble

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    Default Pulsar spindle nut wobble

    I just got a new Novakon Pulsar last week and finally turned it on today. I removed the lever drawbar assembly before I did this as it seemed to need adjustment and I didn't want to risk running it if the plunger was touching the spindle nut. When I ran it at low speed, I can visually see some runout, or wobble even, on the spindle nut itself. I haven't put an indicator to the actual spindle nose, so I don't know if there's a problem there, but visually it looks like everything is spinning true down there. I was just wondering if anyone knew if this was normal? Like do all spindle nuts have some visible wobble? I just haven't seen that many tools to say. Thanks in advance for the help.

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    Default Re: Pulsar spindle nut wobble

    Here's a video of it I took if it helps diagnose. Thanks again.





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    Default Re: Pulsar spindle nut wobble

    That does not appear to me to be necessarily a wobble. Looks to me more like optical illusions. You're looking at the top of the drawbar head, which is partially, and very unevenly, burnished by contact with the LDB. You're also seeing the top of the spindle, which is tubular, and threaded on the OD. The end of the threads are, surprise!, not consistent around the whole OD, due to the thread lead. So, to me, it looks perfectly normal.

    Regards,
    Ray L.



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    Default Re: Pulsar spindle nut wobble

    Mine looks the same. Fortunately my spindle is fine down below. Btw I never had great luck w the lever drawbar and just made my own power drawbar. My LDB always rubbed.



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    Default Re: Pulsar spindle nut wobble

    Quote Originally Posted by brianbonedoc View Post
    Mine looks the same. Fortunately my spindle is fine down below. Btw I never had great luck w the lever drawbar and just made my own power drawbar. My LDB always rubbed.
    I'd guess you have a fairly early LDB? It has been greatly improved over time - more travel, more spring pressure, etc.

    Regards,
    Ray L.



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    Default Re: Pulsar spindle nut wobble

    Yes or so I’ve heard. Great idea but V1.0 didn’t work that hot.



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    Default Re: Pulsar spindle nut wobble

    Yeah, I only had mine off because when I first tried it, it seemed "sticky." When I took it off to get that video, I found that the cam shaft was slightly bent, and even though it was supported by two bearings, it didn't rotate freely.

    I really like the idea of the lever drawbar, but I'm now also trying to think of a better solution than the current one. I've seen your videos of your PDB. It looks really slick. Do you have the plans for it up anywhere?

    Thanks for the reassurance that my spindle is ok.



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    Default Re: Pulsar spindle nut wobble

    Yeah I will try to post the files later. I really have to say it’s the second best upgrade to the pulsar - by far #1 has been PathPilot.



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    Default Re: Pulsar spindle nut wobble

    rickjames - heres the link to my Fusion 360 file for the PDB: A360

    Just double check that the base fits your pulsar as you may have a newer version. Also my air cylinder is the Fabco MP4 (4 stage) but really only needs 3 stage. 2 stages won't supply enough pressure.
    I did add a stack of 12 bellevilles from mcmaster to give over 3000lbs of holding pressure and a longer stroke of the drawbar. It never pulls out even when I screw up the feeds and speeds and cause crazy chatter like it used to w/ the LDB.



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    Default Re: Pulsar spindle nut wobble

    I removed the LDB early on too.
    After lots of fiddling, just went back to a butterfly impact. With manual tool changes, it's hard to get more convenient than those.

    Lee


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    Default Re: Pulsar spindle nut wobble

    Quote Originally Posted by LeeWay View Post
    I removed the LDB early on too.
    After lots of fiddling, just went back to a butterfly impact. With manual tool changes, it's hard to get more convenient than those.
    I tried the impact wrench thing but I hated the noise and i always over shot it and the collet would drop out



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    Default Re: Pulsar spindle nut wobble

    Took a little getting used to.

    Lee


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Pulsar spindle nut wobble
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